JPH11150863A - Watt-hour meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reduce electric power consumption, by controlling in such a manner that transfer means is interrupted when a load factor based on the electric energy measured by electric energy measuring means exceeds a predetermined level. SOLUTION: A central arithmetic section 37 integrates signals depending on an electric energy transmitted from a power arithmetic section 34, determines the integrated watt-hour and outputs to a display section 38. Moreover, the central arithmetic section 37 determines load factor and, if this load factor exceeds a predetermined value, a switching control section 36 drives a switch gear 35 so as to open switches 35a and 35b, thereby creating an interrupted state between the conductor 33 and output terminals 32e, 32f and interrupting power supply to a controllable load 5. By doing this, the power consumption at the controllable lad can be reduced and, as a whole, the electric energy consumed can be reduced. Also, a possibility of exceeding the current limit predetermined by contract can be lowered and the power failure due to an excessive current consumption can be also prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a watt-hour meter.

[0002]

2. Description of the Related Art Conventionally, load control of electric power in general homes or the like is performed by providing a circuit breaker between a watt hour meter and a load device such as a home electric appliance to cut off a circuit when a predetermined current or more flows. The method of stopping supply is common.

In this case, since a large number of load devices are connected to a single circuit breaker, if the amount of current is exceeded and the circuit breaker is activated, all the load devices are turned off at once. Was gone.

[0004] In addition, for high-voltage consumers and the like, a demand contract is concluded with a power supply company to finely manage the power consumption per unit time. Since the power is strictly controlled, there is no possibility that the power is suddenly cut off. However, it is not realistic to extend and apply such a demand contract to consumers such as ordinary households.

[0005]

With the widespread use of air conditioners, the power consumption at a specific time in the summer, in particular, is more prominent than the power consumption in other seasons and time zones. It is desired to reduce.

[0006] In the above-mentioned general homes, there is no restriction on the power consumption up to the amount of current specified by the contract, and there is an environment in which power can be freely consumed up to the amount of current allowed at any time. It is difficult to reduce the amount of power unless the load is controlled consciously.

Further, since the supply of electric power is stopped as soon as the amount of current exceeds the value specified by the contract, the lighting is undesirably reduced especially at night. Furthermore, recently, many home electric appliances have a built-in clock, timer, and the like, and there is a problem that when the power is cut off, the set time and the like are canceled. An object of the present invention is to solve such a problem.

[0008]

According to a first aspect of the present invention, there is provided a watt hour meter interposed between an external power supply and a load for measuring the power consumed by the load. An input terminal connected to the power supply source, a first output terminal connected to a first load device that consumes power, and measuring a current and a voltage flowing through this conductor, thereby consuming the load. A power amount measuring means for measuring the amount of power to be consumed, and a second power consumption means provided in parallel with the first output terminal and consuming power.
A second output terminal connected to the load device, a conductor that connects the input terminal and the output terminal, and a switching unit that connects or disconnects the conductor and the second output terminal;
A watt hour meter having control means for controlling the switching means to shut off when a load factor based on the amount of power measured by the watt-hour measuring means becomes a predetermined value or more.

According to a second aspect of the present invention, there is provided a watt hour meter interposed between an external power supply source and a load for measuring power consumed by the load, and connected to the power supply source. An input terminal, an output terminal connected to a load device that consumes power, a conductor connecting the input terminal and the output terminal, and an amount of power consumed by the load by measuring current and voltage flowing through the conductor. And an alarm output unit that outputs an alarm to the outside when a load factor based on the amount of power measured by the power amount measurement unit becomes a predetermined value or more. It is an electricity meter.

According to a third aspect of the present invention, in the first aspect of the invention, the alarm output means is configured such that a load factor based on the electric energy measured by the electric energy measurement means is higher than a load factor at which the switching means is shut off. A watt hour meter that outputs an alarm to the outside when the power level becomes equal to or higher than a low level.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the alarm output means is adapted to reduce a load factor based on the electric energy measured by the electric energy measuring means to a load factor for interrupting the switching means. The watt hour meter is characterized by estimating a margin time until the arrival, and outputting an alarm to the outside when the margin time becomes equal to or less than a predetermined value.

[0012]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a diagram illustrating the connection relationship of the watt hour meter according to the present invention, and FIG. 2 is a configuration diagram illustrating the configuration of the watt hour meter according to the present invention.

In FIG. 1, a watt-hour meter 3 has a power supply source 1.
The normal load 4 and the controllable load 5 are connected in parallel, and the power supplied by the power supply source 1 and consumed by the normal load 4 and the controllable load 5 is measured.

Normally, power is always supplied to the load 4,
A switch 31 is provided inside the watt-hour meter 3 as a switching means, and the controllable load 5 is connected through the switch 31. The power supply to the controllable load 5 can be controlled by turning on / off the switch 31. Is configured.

In a general home or the like, the normal load 4
As a controllable load 5, a device that does not always need to supply power, such as a television, is connected as a controllable load 5.
The devices to be connected as the respective loads may be selected and connected as needed, and are not limited to the above-described example.

Next, the configuration of the watt hour meter 3 according to the first embodiment will be described with reference to FIG. The watt-hour meter 3 is provided with a terminal block 32 for connection to the power supply source 1 and the loads 4 and 5, and the terminal block 32 has input terminals (1S, 2S) 32a and 32b connected to the power supply source 1. And output terminals (1L, 2L, LA, LB) 32d, 32c,
32e and 32f are provided.

The input terminals (1S, 2S) 32a, 3
2b are output terminals (1L, 2
L) 32d, 32c, and the conductor 33 is connected to output terminals (LA, LB) 32e, 32f via a switch 35 having switches 35a, 35b.

A power calculation unit 34 is connected to the conductor 33. The power calculation unit 34 measures the current and voltage flowing through the conductor 33, calculates the power amount from the measurement result, and calculates the power amount according to the power amount. The signal is output to the central control unit 37.

The central processing unit 37 integrates a signal corresponding to the power amount sent from the power calculation unit 34 to obtain an integrated power amount, and outputs the integrated power amount to the display unit 38. The display unit 38 displays the integrated power amount sent from the central processing unit 37 on a liquid crystal display (not shown) or the like.

Further, the central processing unit 37 calculates a load factor, and when the load factor exceeds a predetermined value, sends a signal to the switching control unit 36. The switching control unit 36 switches the switches 35a and 35b of the switch 35. Is driven to be open, so that the conductor 33 and the output terminals (LA, LB) 32e, 32f are cut off, and the power supply to the controllable load 5 is cut off.

As a result, the power consumption of the controllable load 5 can be reduced, and the power consumption can be reduced as a whole. Further, since the power supply to the controllable load is controlled by the load factor as described above, the possibility of exceeding the amount of current specified by the contract can be reduced, and a power failure due to excess amount of current is prevented beforehand. It becomes possible.

Next, a second embodiment according to the present invention will be described with reference to FIG.
This will be described with reference to FIG. In the second embodiment shown in FIG. 3, an alarm output is added to the first embodiment, and therefore, the same components as those in FIG.

The features of the configuration of the second embodiment are as follows.
In addition to the configuration of the embodiment, the output terminal (A
NN) 32g is added, and the signal line 36a connected to the open / close control unit 36 is connected to the output terminal (ANN) 32g.

In the second embodiment, the load factor is obtained in the central control unit 37 as in the first embodiment, and when the load factor exceeds a predetermined value, the switching control unit 36 At the same time as sending a signal to control the switches 35a and 35b to open, the open / close control unit 36 also outputs an alarm signal to the signal line 36a. Therefore, by connecting an alarm device or the like to the output terminal (ANN) 32g connected to the signal line 36a, it is possible to notify that the power supply to the controllable load 5 has been cut off.

The output terminal (ANN) 32g is connected to the open / close control unit 3
However, when an alarm signal is output to the output terminal (ANN) 32g a predetermined time before the signal is output to the switch 35 as described above, it is connected to the central control unit 37 to control the central control. An alarm signal may be output from the unit 37.

In this way, when the alarm signal is output from the central control unit 37, the time until the predetermined value is exceeded is estimated from the rate of increase of the load factor, and the switching control unit 36 sends a signal to the switch 35. The output terminal (AN
N) An alarm signal may be output to 32g, or the alarm signal may be output at a load factor set lower than the load factor at which the switch 35 is operated. The power supply to the possible load 5 is notified before the power supply is cut off. If a plurality of devices are connected as the controllable load 5, the switch 35 is operated by voluntarily turning off the power of a device which is less necessary. Can be prevented from occurring.

[0027]

According to the present invention, when the load factor exceeds a preset load factor, the switch incorporated in the watt hour meter is opened,
By cutting off the power supply to the load connected to the switch, power consumption can be reduced.

Also, when the amount of current is exceeded as in the prior art, the power supply to all the loads is not cut off, but only the power supply to the load connected to the switch is cut off. If the connection to the load is selected in advance, it is possible to continue supplying power to a load that requires constant power supply.

[Brief description of the drawings]

FIG. 1 is a connection diagram illustrating a connection relationship of a watt hour meter in the present invention.

FIG. 2 is a configuration diagram illustrating a first embodiment of the present invention.

FIG. 3 is a configuration diagram illustrating a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1: Power supply source, 3: Electricity meter, 32d, 32c, 32
e, 32f, 32g output terminal, 34 power calculation unit, 3
5 switch, 35a, 35b switch, 36 switch control section, 37 central control section, 38 display section, 4 normal load, 5 controllable load.

Claims (4)

[Claims] 1. A watt hour meter interposed between an external power supply source and a load for measuring power consumed by the load,
An input terminal connected to the power supply source, a first output terminal connected to a first load device consuming power, and an amount of power consumed by the load by measuring current and voltage flowing through the conductor , A second output terminal connected in parallel to the first output terminal and connected to a second load device consuming power, the input terminal, the first and the second And a switching means for connecting or disconnecting the conductor and the second output terminal, and a load factor based on the electric energy measured by the electric energy measuring means is equal to or greater than a predetermined value. And a control means for controlling the switching means to shut off when the power meter is turned off. 2. A watt hour meter interposed between an external power supply and a load for measuring power consumed by the load,
An input terminal connected to the power supply source, an output terminal connected to a load device that consumes power, a conductor connecting the input terminal and the output terminal, and measuring a current and a voltage flowing through the conductor. Power amount measuring means for measuring the amount of power consumed by the load, and alarm output means for outputting an alarm to the outside when a load rate based on the amount of power measured by the power amount measuring means has become a predetermined value or more. A watt-hour meter comprising: 3. The watt hour meter according to claim 1, wherein said alarm output means is configured such that a load factor based on the power amount measured by said power amount measurement means is lower than a load factor at which said switching means is shut off. A watt hour meter characterized by outputting an alarm to the outside when the level exceeds a set level. 4. The watt hour meter according to claim 1, wherein the alarm output means reaches a load rate at which the load factor based on the power amount measured by the power amount measurement means shuts off the switching means. A watt hour meter for estimating a margin time up to and outputting an alarm to the outside when the margin time falls below a predetermined value.